diff --git a/lib/address.js b/lib/address.js
index 0d1d9cd..4d74e4b 100644
--- a/lib/address.js
+++ b/lib/address.js
@@ -36,8 +36,8 @@ var JSUtil = require('./util/js');
  * ```
  *
  * @param {*} data - The encoded data in various formats
- * @param {Network|String|number} [network] - The network: 'livenet' or 'testnet'
- * @param {string} [type] - The type of address: 'script' or 'pubkey'
+ * @param {Network|String|number=} network - The network: 'livenet' or 'testnet'
+ * @param {string=} type - The type of address: 'script' or 'pubkey'
  * @returns {Address} A new valid and frozen instance of an Address
  * @constructor
  */
@@ -86,8 +86,8 @@ function Address(data, network, type) {
 /**
  * Internal function used to split different kinds of arguments of the constructor
  * @param {*} data - The encoded data in various formats
- * @param {Network|String|number} [network] - The network: 'livenet' or 'testnet'
- * @param {string} [type] - The type of address: 'script' or 'pubkey'
+ * @param {Network|String|number=} network - The network: 'livenet' or 'testnet'
+ * @param {string=} type - The type of address: 'script' or 'pubkey'
  * @returns {Object} An "info" object with "type", "network", and "hashBuffer"
  */
 Address.prototype._classifyArguments = function(data, network, type) {
@@ -186,8 +186,8 @@ Address._classifyFromVersion = function(buffer){
  * Internal function to transform a bitcoin address buffer
  *
  * @param {Buffer} buffer - An instance of a hex encoded address Buffer
- * @param {string} [network] - The network: 'livenet' or 'testnet'
- * @param {string} [type] - The type: 'pubkeyhash' or 'scripthash'
+ * @param {string=} network - The network: 'livenet' or 'testnet'
+ * @param {string=} type - The type: 'pubkeyhash' or 'scripthash'
  * @returns {Object} An object with keys: hashBuffer, network and type
  * @private
  */
@@ -285,8 +285,8 @@ Address.createMultisig = function(publicKeys, threshold, network) {
  * Internal function to transform a bitcoin address string
  *
  * @param {string} data
- * @param {String|Network} [network] - either a Network instance, 'livenet', or 'testnet'
- * @param {string} [type] - The type: 'pubkeyhash' or 'scripthash'
+ * @param {String|Network=} network - either a Network instance, 'livenet', or 'testnet'
+ * @param {string=} type - The type: 'pubkeyhash' or 'scripthash'
  * @returns {Object} An object with keys: hashBuffer, network and type
  * @private
  */
@@ -352,8 +352,8 @@ Address.fromScript = function(script, network) {
  * Instantiate an address from a buffer of the address
  *
  * @param {Buffer} buffer - An instance of buffer of the address
- * @param {String|Network} [network] - either a Network instance, 'livenet', or 'testnet'
- * @param {string} [type] - The type of address: 'script' or 'pubkey'
+ * @param {String|Network=} network - either a Network instance, 'livenet', or 'testnet'
+ * @param {string=} type - The type of address: 'script' or 'pubkey'
  * @returns {Address} A new valid and frozen instance of an Address
  */
 Address.fromBuffer = function(buffer, network, type) {
@@ -365,8 +365,8 @@ Address.fromBuffer = function(buffer, network, type) {
  * Instantiate an address from an address string
  *
  * @param {string} str - An string of the bitcoin address
- * @param {String|Network} [network] - either a Network instance, 'livenet', or 'testnet'
- * @param {string} [type] - The type of address: 'script' or 'pubkey'
+ * @param {String|Network=} network - either a Network instance, 'livenet', or 'testnet'
+ * @param {string=} type - The type of address: 'script' or 'pubkey'
  * @returns {Address} A new valid and frozen instance of an Address
  */
 Address.fromString = function(str, network, type) {
diff --git a/lib/privatekey.js b/lib/privatekey.js
index 24beed2..5af449d 100644
--- a/lib/privatekey.js
+++ b/lib/privatekey.js
@@ -29,7 +29,7 @@ var Random = require('./crypto/random');
  * ```
  *
  * @param {string} data - The encoded data in various formats
- * @param {Network|string} [network] - a {@link Network} object, or a string with the network name
+ * @param {Network|string=} network - a {@link Network} object, or a string with the network name
  * @returns {PrivateKey} A new valid instance of an PrivateKey
  * @constructor
  */
@@ -78,7 +78,7 @@ var PrivateKey = function PrivateKey(data, network) {
  * different kinds of arguments passed to the constructor.
  *
  * @param {*} data
- * @param {Network|string} [network] - a {@link Network} object, or a string with the network name
+ * @param {Network|string=} network - a {@link Network} object, or a string with the network name
  * @return {Object}
  */
 PrivateKey.prototype._classifyArguments = function(data, network) {
@@ -144,7 +144,7 @@ PrivateKey._isJSON = function(json) {
  * Internal function to transform a WIF Buffer into a private key
  *
  * @param {Buffer} buf - An WIF string
- * @param {Network|string} [network] - a {@link Network} object, or a string with the network name
+ * @param {Network|string=} network - a {@link Network} object, or a string with the network name
  * @returns {Object} An object with keys: bn, network and compressed
  * @private
  */
@@ -186,7 +186,7 @@ PrivateKey._transformBuffer = function(buf, network) {
  * Internal function to transform a BN buffer into a private key
  *
  * @param {Buffer} buf
- * @param {Network|string} [network] - a {@link Network} object, or a string with the network name
+ * @param {Network|string=} network - a {@link Network} object, or a string with the network name
  * @returns {object} an Object with keys: bn, network, and compressed
  * @private
  */
@@ -267,7 +267,7 @@ PrivateKey.fromString = PrivateKey.fromWIF = function(str) {
 /**
  * Instantiate a PrivateKey from random bytes
  *
- * @param {string} [network] - Either "livenet" or "testnet"
+ * @param {string=} network - Either "livenet" or "testnet"
  * @returns {PrivateKey} A new valid instance of PrivateKey
  */
 PrivateKey.fromRandom = function(network) {
@@ -279,7 +279,7 @@ PrivateKey.fromRandom = function(network) {
  * Check if there would be any errors when initializing a PrivateKey
  *
  * @param {string} data - The encoded data in various formats
- * @param {string} [network] - Either "livenet" or "testnet"
+ * @param {string=} network - Either "livenet" or "testnet"
  * @returns {null|Error} An error if exists
  */
 
@@ -298,7 +298,7 @@ PrivateKey.getValidationError = function(data, network) {
  * Check if the parameters are valid
  *
  * @param {string} data - The encoded data in various formats
- * @param {string} [network] - Either "livenet" or "testnet"
+ * @param {string=} network - Either "livenet" or "testnet"
  * @returns {Boolean} If the private key is would be valid
  */
 PrivateKey.isValid = function(data, network){
diff --git a/lib/script/interpreter.js b/lib/script/interpreter.js
index 2b4b49f..2226c16 100644
--- a/lib/script/interpreter.js
+++ b/lib/script/interpreter.js
@@ -37,7 +37,7 @@ var Interpreter = function Interpreter(obj) {
  * separately.
  * @param {Script} scriptSig - the script's first part (corresponding to the tx input)
  * @param {Script} scriptPubkey - the script's last part (corresponding to the tx output)
- * @param {Transaction} [tx] - the Transaction containing the scriptSig in one input (used
+ * @param {Transaction=} tx - the Transaction containing the scriptSig in one input (used
  *    to check signature validity for some opcodes like OP_CHECKSIG)
  * @param {number} nin - index of the transaction input containing the scriptSig verified.
  * @param {number} flags - evaluation flags. See Interpreter.SCRIPT_* constants
diff --git a/lib/script/script.js b/lib/script/script.js
index aa21f98..199fa49 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -24,7 +24,7 @@ var JSUtil = require('../util/js');
  * See https://en.bitcoin.it/wiki/Script
  *
  * @constructor
- * @param {Object|string|Buffer} [from] optional data to populate script
+ * @param {Object|string|Buffer=} from optional data to populate script
  */
 var Script = function Script(from) {
   if (!(this instanceof Script)) {
@@ -540,7 +540,7 @@ Script.prototype.removeCodeseparators = function() {
  * requiring m of those public keys to spend
  * @param {PublicKey[]} publicKeys - list of all public keys controlling the output
  * @param {number} threshold - amount of required signatures to spend the output
- * @param {Object} [opts] - Several options:
+ * @param {Object=} opts - Several options:
  *        - noSorting: defaults to false, if true, don't sort the given
  *                      public keys before creating the script
  */
@@ -712,7 +712,7 @@ Script.fromAddress = function(address) {
 };
 
 /**
- * @param {Network} [network]
+ * @param {Network=} network
  * @return {Address} the associated address for this script
  */
 Script.prototype.toAddress = function(network) {
diff --git a/lib/uri.js b/lib/uri.js
index db5a38c..a9f964f 100644
--- a/lib/uri.js
+++ b/lib/uri.js
@@ -26,7 +26,7 @@ var JSUtil = require('./util/js');
  * ```
  *
  * @param {string|Object} data - A bitcoin URI string or an Object
- * @param {Array.<string>} [knownParams] - Required non-standard params
+ * @param {Array.<string>=} knownParams - Required non-standard params
  * @throws {TypeError} Invalid bitcoin address
  * @throws {TypeError} Invalid amount
  * @throws {Error} Unknown required argument
@@ -92,7 +92,7 @@ URI.fromJSON = function fromJSON(json) {
  * ```
  *
  * @param {string|Object} data - A bitcoin URI string or an Object
- * @param {Array.<string>} [knownParams] - Required non-standard params
+ * @param {Array.<string>=} knownParams - Required non-standard params
  * @returns {boolean} Result of uri validation
  */
 URI.isValid = function(arg, knownParams) {